Crayfish or crawfish is a general term for small crustaceans other than crabs, including the lobster and similar. They are plain boiled. Mrs.B suggests them as a garnish for poultry.


Original Receipt in 'The Book of Household Management', 1861, edited by Isabella Beeton (See Mrs.B)

CRAYFISH.
246. Crayfish should be thrown into boiling water, to which has been added a good seasoning of salt and a little vinegar. When done, which will be in ΒΌ hour, take them out and drain them. Let them cool, arrange them on a napkin, and garnish with plenty of double parsley.
Note: This fish is frequently used for garnishing boiled turkey, boiled fowl, calf's head, turbot, and all kinds of boiled fish.